How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Low-Pressure Iron and Steel Threaded Pipe Fittings with Sealant
To prevent leaks in low-pressure lines, the male threads on these fittings have an acrylic sealant already applied for extra protection. Also known as Pressure Class 125 or 150 fittings. Made of either iron or steel, they’re best in noncorrosive environments. Even with sealant, threaded connections can be taken apart for maintenance and repair.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Water
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 Iron and Steel
- For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Water
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 Iron and Steel
- For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Water
- Pressure Class:
Iron: 125
Steel: 150 - Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 Iron and Steel
Pipe Size | Plug Construction | Max. Pressure | Material | Specifications Met | Each | |
NPT Male | ||||||
|---|---|---|---|---|---|---|
| 1 1/4 | Solid | 150 psi @ 72° F | Steel | ASME B16.14 | 0000000 | 000000 |
| 1 1/2 | Solid | 150 psi @ 72° F | Steel | ASME B16.14 | 0000000 | 00000 |
| 2 | Solid | 150 psi @ 72° F | Steel | ASME B16.14 | 0000000 | 00000 |
| 2 1/2 | Hollow | 150 psi @ 72° F | Iron | ASME B16.14 | 0000000 | 00000 |
| 3 | Hollow | 150 psi @ 72° F | Iron | ASME B16.14 | 0000000 | 00000 |
| 4 | Hollow | 150 psi @ 72° F | Iron | ASME B16.14 | 0000000 | 00000 |
Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings
The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: See table
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
Pipe Size | ||||||||
|---|---|---|---|---|---|---|---|---|
| (A) | (B) | Pressure Class | Max. Pressure | Max. Steam Pressure | Material | Specifications Met | Each | |
NPT Male × NPT Female | ||||||||
| 1 1/4 | 3/8 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126 | 00000000 | 00000 |
| 1 1/2 | 3/8 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126 | 00000000 | 00000 |
| 1 1/2 | 1/2 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126 | 00000000 | 0000 |
| 2 | 1/2 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126 | 00000000 | 00000 |
| 2 | 3/4 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126 | 00000000 | 00000 |
| 2 1/2 | 1 1/2 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126 | 00000000 | 00000 |
| 3 | 2 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126 | 00000000 | 00000 |
| 3 | 2 1/2 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126 | 0000000 | 00000 |
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: See table
- Specifications Met:
NPT Steel: SAE J531
NPT Iron: ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed
BSPT: ASTM A197, DIN EN 10226 - Pipe Nipples and Pipe: Use Schedule 40 steel
- Flanges: Use Class 150 galvanized steel
| Pipe Size | Plug Construction | Pressure Class | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | |||||||
|---|---|---|---|---|---|---|---|
| 2 1/2 | Hollow | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | 00000000 | 000000 |
| 3 | Hollow | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | 00000000 | 00000 |
| 3 1/2 | Hollow | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | 00000000 | 000000 |
| 4 | Hollow | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | 00000000 | 000000 |
Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings with Sealant
The male threads on these fittings have a sealant applied for extra leak protection. Fittings are made of galvanized iron or steel, which have fair corrosion resistance. Also known as Pressure Class 125 or 150 fittings, they are for use in low-pressure applications.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Oil, Natural Gas, Water
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
- For Use With: Air, Oil, Natural Gas, Water
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
Medium-Pressure Iron and Steel Threaded Pipe Fittings
With better strength than our low-pressure iron and steel pipe fittings, these can handle medium-pressure applications. They are for use in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class : 300
- Specifications Met: See Table
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 or 600 steel
| Pipe Size | Drive Size | Max. Pressure | Max. Steam Pressure | Material | Specifications Met | Each | |
NPT Male | |||||||
|---|---|---|---|---|---|---|---|
| 1/4 | 1/4" | 2,000 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed | 0000000 | 00000 |
| 3/8 | 5/16" | 2,000 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed | 0000000 | 000 |
| 1/2 | 3/8" | 2,000 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed | 0000000 | 0000 |
| 3/4 | 9/16" | 2,000 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed | 0000000 | 0000 |
| 1 | 5/8" | 2,000 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed | 0000000 | 0000 |
NPTF Male | |||||||
| 1 1/4 | 3/4" | 300 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B16.14 | 00000000 | 0000 |
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class : 300
- Specifications Met: See Table
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 steel
| Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Specifications Met | Each | |
NPT Male | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B1.20.1, ASME B16.14 | 0000000 | 00000 |
| 1/4 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B1.20.1, ASME B16.14 | 0000000 | 000 |
| 3/8 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Steel | ASME B1.20.1, ASME B16.14 | 0000000 | 000 |
| 1/2 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 0000 |
| 3/4 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 0000 |
| 1 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 0000 |
| 1 1/4 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 00000 |
| 1 1/2 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 00000 |
| 2 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 00000 |
| 2 1/2 | Solid | 400 psi @ 72° F | 300 psi @ 550° F | Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 00000 |
Premium Low-Pressure Stainless Steel Threaded Pipe Fittings with Certification
Unlike other stainless steel fittings, these are made in the U.S.A. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings except 1/4" and 3/8" plugs and plugs with hex drive adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 150 low-pressure stainless steel fittings. They also meet either ASTM A351 or A479 requirements for parts that will be used in pressure systems.
These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong. 316 stainless steel fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
For technical drawings and 3-D models, click on a part number.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Fabrication: Heat Treated
- Specifications Met: See table
- Certification: Material Certificate with Traceable Lot Number
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Pipe Size | Drive Size | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
NPTF Male | ||||||
| 1/4 | 1/4" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 3/8 | 5/16" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 0000 |
| 1/2 | 3/8" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 0000 |
| 3/4 | 9/16" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 1 | 5/8" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/4 | 3/4" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/2 | 1" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 2 | 1" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: See table
- Fabrication: Heat Treated
- Specifications Met: See table
- Certification: Material Certificate with Traceable Lot Number
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Pipe Size | Pressure Class | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
NPTF Male | ||||||
| 1/4 | 150 | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 3/8 | 150 | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 0000 |
| 1/2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 3/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 1 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |